No User Serviceable Parts

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When I was young - back in the old, dark days, just a few years after the Stone Age - you could replace tubes in your TV if it went on the blink. You could take apart your transistor radio and solder the wires that had come loose. You could fix things. Even my dinosaur desktop computer has accessible and replaceable parts and components that I can mess around with. But over the years, instead of the screws that let you take the device apart, there appears a sticker warning "No User Serviceable Parts". Sometimes there is even a threat of death by electrocution or perhaps, confusion, should you attempt to take off the back of the device and view its startling array of solid state circuitry. But, being a dummy, I bought a tablet anyway. And I have enjoyed it and used it for many different things. I happily played my games, surfed the web, read books on the Kindle app, watched videos, etc., without once thinking what I would do if it broke. It broke. Well, just the button that turns it off and on has broken I have searched the net for articles or videos on how to fix it. But the only videos I can find are very confusing and the repairs are being performed on tablets that have these tiny screws on the side to take off the back. Mine has no screws. I can see no point of entry. Luckily, I never turn the tablet off. So when the button broke, the tablet was on. It goes into screen sleep mode if it is inactive, and usually I would push the button to make the screen light up again. However, the button is broken. But I discovered that by plugging in the charger, the screen is made to appear just to tell me the percentage of charge the battery has. This lets me in again. And while I am using it, I set the display to stay on for the longest period of time possible to avoid it going off again if I set it down. But I would much rather fix the button. Have you had to take something for repair or have you had to buy a new device because it was designed to prevent repairs? Does anyone know how to break into a Dell Venue 7 and fix the button?